Phenol precursors are provided having the formula (Q'ZQO).sub.m Y in which Q is a bivalent aromatic radical, Q' is a univalent aromatic radical or the moiety of a bivalent aromatic radical, Z is --SO.sub.2 --, --SO--, --CO-- or --CH.sub.2 --, Y is --CO-- or --POCl.sub.2 and m is an integer having the value 1 when Y is --POCl.sub.2 and the value 2 when Y is --CO--.
The invention relates to the preparation of a crosslinked polymeric film bearing ionic groupings.
The process consists in extruding a material comprising at least one prepolymer, in polymerizing said material after extrusion, and in subjecting the extruded material to a chemical reaction for grafting ionic groupings. The prepolymer comprises repeating units each comprising at least one aromatic group GA and at least one functional group GF; it bears at least one group GP which is polymerizable thermally at a temperature greater than the extrusion temperature, or photochemically, and also at least one reactive group GR which allows the grafting of ionic groupings.
The films are useful as a membrane for fuel cells or electrodialysis, as an electrolyte of a lithium battery, of a supercapacitor or of an electrochromic device, or as an ion exchange membrane.
Ion-Conducting Polymers And Membranes Comprising Them
申请人:Colquhoun Matthew Howard
公开号:US20070196734A1
公开(公告)日:2007-08-23
An ion-conducting polymer wherein at least 80% of the repeat units comprise an ion-conducting region and a spacer region is disclosed. The ion-conducting region has an aromatic backbone of one or more aromatic groups, wherein at least one ion-conducting functional group is attached to each aromatic group. The spacer region has an aromatic backbone of at least four aromatic groups, wherein no ion-conducting functional groups are attached to the aromatic backbone. The polymer is suitable for use as a fuel cell membrane, and can be incorporated into membrane electrode assemblies.
Production of aromatic polyethers by reacting i) a mixture of a bisphenol and a dihalobenzenoid compound or ii) a halophenol, in which dihalobenzenoid compound or halophenol the halogen atoms are activated by ortho or para -SO2- or -CO- groups, with an alkali metal (bi)-carbonate, wherein the reaction is carried out in the absence of a solvent and in the presence of an infusible particulate support substance, preferably inorganic or polymeric, yielding a reaction medium in the form of a free-flowing powder by the end of the reaction.
Polyaryletherketones are prepared by polymerisation of a halogen-containing aryl ketone in the presence of a stoichiometric excess of a base and a copper salt. The halogen-containing aryl ketone may be 4-chloro-4'-hydroxybenzophenone. A basic copper salt may be used but the base used to provide the excess of base is an alkali metal hydroxide, carbonate or bicarbonate.